Rename QA_OVERRIDE_GCC3_OPTIONS to CCC_OVERRIDE_OPTIONS. <rdar://14578381>

Continue to accept the old name for a while to make it an easier transition
for people who rely on this.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199283 91177308-0d34-0410-b5e6-96231b3b80d8